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RPO Z77 was the 1980 Chevy Sport/GMC Street Coupe exterior graphics packages that exclusively used the cloth seat with the addition of the floor carpeting, deluxe front grille, and deluxe instrument cluster. The option also included Rally wheels as standard, was available only on the 1976 to 1981 Chevy/GMC short bed 1/2 ton pickups.
Wiring diagrams for 1980 trucks are contained in a separate Wiring. Diagram Booklet.... Some of these service operations require the use of tools specially designed .... 1-1/2 Ton. 2-3/4 Ton. 3-1 Ton. 4-1/2 Ton (W/HDSusp). Fig. 0A-3-Vehicle Identification Number ... Right Hand Side of Cylinder Block at Rear of Distributor.
Timing at idle (degrees BTDC) 0 federal and 4 California (chapter 5, page 183, Haynes Chevy and Gmc pick-ups manual 1967 thru 1987) If you have any othe questions I have the manual, I have an 86 k10 4x4 w/350.